The idea is that a small on board chip will put the gun into safe mode until the ref unlocks the gun.

The chip would work on a radio frequency; the gun would get a special code from the reff' s watch/wrist band, which would be controlled by the reff. The reff would punch in a six-digit code, to the
gun, and it would shut off. The player would then be told he was out and a large red light on his regular armband would flash.

This idea although probably not cheap would be great for large tournaments.

No you do not have to delete them. However if someone says marked for deletion with good reason (for instance widely known to exist) it is a good idea to delete the idea yourself (to save the moderators some work).